Experiment with json_to_recordset

[benjie]

The json_array_elements code is really verbose. Maybe json_to_recordset will be more straightforward both for humans to read and for PostgreSQL to parse (and maybe even execute?)

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Latest commit: f771d185910dc9d593894b54fc44ff57a470910f

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[benjie]

Put on hold because I need to stop fiddling and get V5 out. Can change this later.